Alloy



Patented Apr. 14, 1942 Baker & Company, Inc., Newark, N. J., a corporation of New Jersey Serial No. 401,652

No Drawing. Application July 9, 1941,

6 Claims.

This invention relates to alloys and is con cerned in particular with platinum metal alloys.

It is one object of my invention to provide alloys-of great corrosion resistance, high melting point and great hardness and strength. It is another object of my invention to provide such alloys of great electrical resistance; It is a further object of my invention to provide such alloys of low specific gravity and low cost.

This application is a continuation in part of 1 my application No. 288,572, filed August 5, 1939.

The alloys according to my invention consist of platinum, palladium and ruthenium. In such alloys according to my invention the platinum content may be as low as'10% and as high as 80%, the palladium content may be as low as 12% and as high as 90% and the ruthenium content may vary from l%-15%. In more specific emmore particularly for instance'alloys of from 60% to 80% platinum, from about 15% to 30% palladium and from 1% to 10% ruthenium, such as alloys of 74% platinum palladium and 6% ruthenium, or of 70% platinum 24% palladium and 6% ruthenium, or even of- 80% platinum 14% palladium and 6% ruthenium, orthe alloys may comprise more particularly for instance alloys of from 25% to 60% platinum, from to 74% palladium and from 1% to 10% ruthenium such as alloys of 30% platinum 67% palladium and 3%, ruthenium, or of 40% platinum 57% palladium and 3% ruthenium. With increasing palladium content the alloys have decreasing specific gravity, increasing tensile strength, increasing electrical resistance and decreasing melting point notwithstanding their high tensile strengtfi'afid bodiments the palladium content of such alloy s/great liardness. The alloys according to my in- 7 should not fall below about lm afififie rutlihi- 20 vention are also highly resistant to corrosion.

um content'should not exceed about 10%. In its best embodiment the alloysconsist entirely of platinum palladium ruthenium'in the proportions specified herein, although of course minor quantities of other metals may be present so long 1.

as they do not substantially aflect the beneficial properties and characteristics of my alloys.

The following table will illustrate the nature and properties of the alloys according to my invention: l

Alloys containing at least about palladium show particularly favorable properties.

The alloys according to my invention are capableof being used advantageously in widely different fields. They may be used in the construction of corrosion resistant apparatus and they may be used in the field of jewelry and the decorative arts. They may be used in the electrical industry for instance as electricalresistance wires, a

' 30 use more particularly described and claimed in Composition Tensile strength E10 gation,

percent Density Menu? on 2 pom Pt Pd Ru Hard Annealed Lbalsq. in. Lba/sg. in. GrJcc. C.

10 87 3 82,500 42, 400 29.0 12.6 1,575 20 77 3 83,700 44, 200 34. 0 13. 2 1, 595 40 57 3 79, 000 50, 100 33. 0 s14. 5 1, 640 60 37 3 86,200 54,400 33. 3 16.4 1, 680 24 6 103, 400 I 70, 700 27. 5 l7. 3 1, 700 74 20 6 107, 200 72, 400 31. 5 17.8 1, 710 14 6 137, 000 83, 700 30. 5 18. 8 1, 730

In the alloys specified in the above table the electrical resistivity ohms/mil it. varies from- 153 for the alloy of 10% platinum 87% palladium and 3%ruthenium to 220 for the alloy of 60% platinum 37 palladium and 3% ruthenium and from 250 to 235 for the alloy of 70% platinum 24% palladium and 6% ruthenium and the alloy of 80% platinum 14% palladium and 6% ruthenium, respectively.

The alloys according to my invention may be such as to have a relatively high palladium content and .such as to have a relatively low palladium content. Thus the alloys may comprise my co-pending application Serial No. 288,572 filed August 5,1939. Such alloys-may be used in the form of wire, sheet or other manufactured article and may be given intricate shapes and forms due to their great hardness combined with great ductility.

What I claim is: 1

1. An alloy of ten (10) percent to eighty (80) percent platinum, twelve (12) percent to ninety (90) percent palladium, and one (1) percent to fifteen (15) percent ruthenium. 1

2. An alloy of sixty (60) percent to eighty (80)- percent platinum, fifteen (15) percent to thirty All such alloys "are" surprisingly ductile (30) percent palladium, end, one (1) percent to ten percent ruthenium.

3. An alloy of seventy ('70) percent to seventyfour (74) percent platinum,'twenty percent to twenty-four (24) percent palladium, and about six (6) percent ruthenium.

4. An alloy of twenty-five (25) percent to sixty (60) percent platinum, thirty percent to seventy-four (74) percent palladium, and one 5. An alloy of thirty (30) ercent to rem (40) percent platinum, fifty-seven (57) percent to percent to seventydour (74) percent palladium,

and one (1) percent to ten (10) percent ruthenium. 

